Canada - Tire Monitoring System - TPMS Registration
BulletinTSB2118
Issue Date
June 20, 2005
Title
DIRECT TIRE PRESSURE WARNING SYSTEM SENSOR REGISTRATION
Component
BODY ELECTRICAL
Models
'06 GS300 & GS430
INTRODUCTION:
A direct Tire Pressure Warning System (TPWS) is now standard equipment on all 2006 model year GS300 and GS430 vehicles.
A tire pressure sensor (or tire pressure monitor) is attached to each wheel directly sensing the air pressure of each tire. The Tire Pressure Warning System detects the pressure of each tire, including the spare tire, and illuminates a tire pressure warning light! to inform the driver of low tire pressure.
A Reset switch has also been added to the GS300 and GS430 to set the tires' threshold pressure (the lowest tire pressure allowed before the warning light comes on) so that different pressure requirements from front and rear tires can be accommodated.
This TSB will explain how to:
- Locate the TPWS sensor ID numbers.
- How to register TPWS sensor ID numbers using the Toyota Diagnostic Tester.
- Utilize the reset switch to initialize the threshold detection pressure.
APPLICABLE VEHICLES:
- 2006 model year GS300 and GS430 vehicles.
REQUIRED SSTS:
WARRANTY INFORMATION:
TIRE SENSOR ID NUMBER:
Each tire pressure sensor has a unique ID (refer to Figure 1 of this TSB). These ID numbers must match the numbers registered in the TPWS ECU. In the event that one of the following services are performed, the ID numbers must be manually re-recorded in the TPWS ECU to ensure proper operation.
- Replacing the tire pressure monitor valve sub-assembly (tire pressure sensor including wheel assembly).
- Replacing the tire pressure monitor ECU.
NOTE:
- To help in the ID number retrieval process, it is recommended that you record the ID numbers on a separate document (Repair Order, PDS Checksheet, etc.) so they can be easily accessed for future use.
- In the event that the IDs were not previously recorded or if using the scan tool, the current registered ID numbers show all zeroes or # signs in the Data List, it will be necessary to remove each tire from the wheel to physically locate and record the sensor IDs imprinted on each sensor. Refer to step 1.
- When the ECU does not respond due to initialization being performed with the wrong ID registered, connect terminals 13 (TC) and 4 (CG) of the DLC3 to restore the ECU.
LOCATING THE SENSOR ID NUMBERS:
Using the scan tool, follow the screen prints to access and confirm the currently registered tire pressure Sensor ID numbers.
On screen "G" above, record the codes listed in the REGIT ID 1-4 so they can be manually re-entered during the Registration process. The codes listed in the Data List REGIT ID 1-4 are the actual codes registered in the TPWS ECU (these codes may or may not be the correct codes for the tires currently on the vehicle).
NOTE:
It is important that each of these codes be recorded on a separate document because once you enter the registration code, they will be erased. In addition, if you replace one or more sensors, the code written on the new sensor needs to be recorded as well.
You will confirm the codes are for this vehicle during the registration process. If they are not correct, you will have to locate the correct codes on each tire and wheel assembly to complete the registration process. Refer to instruction on how to locate the sensor codes.
If the REGIT IDs display all zeros or # signs, that means there are no current codes registered in the system. You must physically locate the sensor IDs on each sensor before beginning the registration process. Refer to instruction on how to locate sensor codes. Once you have the codes for all 5 tires, proceed to the Tire Pressure ID Registration process.
NOTE:
To Confirm that the ID numbers registered in the ECU are correct:
1. Let 25% or more of the recommended air pressure out of one tire at a time.
2. When the TPWS warning light comes on, check the ECU diagnosis, and write down the ID for that wheel.
3. Check that the registered ID is correct for each wheel. (If an ID number is incorrect, a system fault will occur after about 60 minutes of driving, with a diagnostic code output due to incorrectly registered ID.)
When replacing sensors
1. Remove the current sensor and write down its ID number. Refer to Figure 1.)
2. Write down the ID number of the replacement sensor. (Refer to Figure 1.)
3. Repeat the above steps for each sensor that needs replacement.
4. Go to the Tire Pressure ID Registration Procedure.
(Input the replacement sensor ID number into the ECU instead of the current sensor ID number)
When replacing the ECU
1. Write down all the IDs registered in the current ECU, and proceed to Tire Pressure ID Registration Procedure.
2. If the IDs registered in the ECU do not display on the intelligent tester (ie. If the display shows all zeros or # signs), follow the directions in the repair manual to remove the tires from the wheels, and locate the IDs printed on the sensors. Make a list of the IDs for the 5 wheels (including spare), and go to the Tire Pressure ID Registration Procedure.
TIRE PRESSURE ID REGISTRATION PROCEDURE:
1. Connect the Diagnostic Tester to DLC3.
2. Turn the ignition switch to the ON position.
Follow the screen flow.
3. View the Lexus Diagnostic Tester Data List and ensure that all tires are reading tire pressure and temperature correctly (this could take up to 5 minutes).
NOTE:
- If the sensor code does not read correctly within 5 minutes, you will need to locate the actual code on the TPWS tire sensor (refer to Locating the Sensor ID Numbers).
- It is extremely critical that the Main/2nd select switch is set to " MAIN" for the main tire set and "2ND" for the 2nd tire set. You will experience the incorrect ID number on the Data List if the select switch is in the incorrect position.
ID registration procedure and confirmation
When the tire pressure monitor valve and tire pressure monitor ECU are replaced, be sure to follow the procedures in the repair manual to register the tire pressure monitor valve IDs, including the valve ID for the spare tire, and confirm that the IDs have been registered normally. When confirming that the IDs have been registered normally, tire pressure must decrease at least 40 kPa (0.4 kg/cm2, 5.8 psi) within 30 seconds. (See Lexus 2006 GS300/430 Repair Manual, "Confirmation of Transmission ID Registration")
4. Set the Threshold Pressure. Refer to the Setting the Threshold Detection Pressure procedure below.
RESET SWITCH PURPOSE AND FUNCTION:
A Reset switch has been added to the GS300 and GS430 to set threshold detection pressure of the tires. Due to the different tire pressure requirements from front to rear tires and required pressures of different wheel and tire combinations, it is necessary to perform this procedure under the following conditions.
- New vehicle delivery
- Tire rotation when different pressures required for front and rear tires
- Required pressure of wheel assembly
- Tire pressure sensor replacement
- Tire pressure monitor ECU replacement
NOTE:
Refer to driver's door jam for specific tire pressure settings.
INITIALIZING THRESHOLD DETECTION PRESSURE:
1. Set the tire air pressure for all wheels, including the spare, to the specified value. Refer to the driver's door jam for specific tire pressure settings.
2. Press and hold the tire pressure warning reset switch for 3 seconds or more with the ignition switch ON. After depressing the reset switch for 3 seconds or more, the tire pressure warning lamp will blink 3 times (1 second ON, 1 second OFF).
3. Allow the system to recognize the threshold detection pressure.
A. Do not turn the ignition switch OFF during initialization (This process takes about 3 minutes). Initialization will be complete when signals are received from all wheels including the spare. Initialization will be postponed until next ignition switch ON if the ignition switch is turned OFF during the process.
B. Confirm that initialization is complete using the hand-held tester.
C. If initialization was incomplete, move the vehicle forward or backward about one meter and repeat procedures A and B.
NOTE:
- Threshold detection pressure set due to initialization can be checked in INIT THRESHOLD 1 to 4 in the TDT.
- For further details of the Tire Pressure Warning System and functions of the RESET switch, refer to the new car features manual outlined in ETAS: 2006 model year GS 300 or GS 430 Manual: New Car Features: Chassis and Drivetrain: Tire & Wheel.
4. Vehicle condition for initialization
A. Perform initialization when the vehicle is in cold state and tire pressure is adjusted to specified value.
Hint:
A cold state means that the travel distance is less than 1.6 km after vehicle has been parked for 3 hours or more.
B. If tire pressure is not at specified value with the vehicle out of a cold state, adjust the tire pressure to specified value, then add 20 to 30 kPa (0.2 to 0.3 kg/cm2, 2.9 to 4.4 psi)
Hint:
If tire pressure is not at the specified value when initialization is performed, the warning level will also be affected.
5. If ambient temperature is lower than when the tire pressure is adjusted (such as winter), the tire pressure warning system will tend to warn the driver of a decrease in the tire pressure more frequently. In such a case, add 20 to 30 kPa (0.2 to 0.3 kg/cm2, 2.9 to 4.4 psi) of air pressure approximately 10 minutes after pressing the tire reset switch (with the ignition switch in the ON position). (Initialization process requires a maximum of approximately 10 minutes after the rest switch.)